UK construction site electrical distribution boxes typically range from £100 to over £1,500 depending on voltage, capacity, and features.

Typical Price Ranges

• Small 110V or 240V units (4–6 outlets, light-duty): £100–£300. These are compact, portable “spider boxes” suitable for small tools and light construction tasks, often with weatherproof casings and basic overload protection .
• Medium-duty 110V/240V units (up to 16 outlets, 125–250A rating): £300–£700. These units are more robust, often featuring multiple MCBs, RCCBs, and IP-rated enclosures for dust and moisture protection .
• Heavy-duty mains distribution assemblies (400–630A, Form 4b Type 7, multiple incomers/outgoers): £1,000–£1,500+. These are designed for large construction sites, offering segregated circuits, adjustable electronic trips, and high safety standards .

Factors Affecting Price

1. Voltage and Current Rating: Higher amperage and mains voltage units cost more due to larger switchgear and safety components .
2. Number of Outlets: More sockets and circuit segregation increase complexity and price .
3. Build Quality: Weatherproof, dustproof, and impact-resistant enclosures (IP-rated) are more expensive but essential for outdoor construction sites .
4. Safety Features: Units with MCCBs, RCDs, emergency stop buttons, and electronic trip settings command higher prices .
5. Brand and Supplier: Trusted brands like Schneider, Sealey, Faithfull, and Defender may cost more but offer reliability and compliance with UK safety standards .

Where to Buy

• Blakley Electrics: Offers custom and stock mains distribution assemblies from 100A to 4000A with short lead times .
• MyToolShed.co.uk: Stocks compact and heavy-duty site distribution boxes from 110V to 240V, suitable for various trades .
• One-Elec: Supplies Schneider Kaedra site boxes with waterproof and dustproof enclosures, suitable for professional construction sites .
• Tooled-Up.com: Offers a wide range of site distribution boxes with fast delivery options . For precise pricing, it is recommended to contact suppliers directly, as costs vary with configuration, lead time, and optional features.